Loud-speaker



1929- v A. E. JORDAN ET AL 1,738,955

LOUD SPEAKER Filed Aug. 27, 1926 Patented Dec. 10, i929 UNITED STATES PATENT OFFICE ALFRED EDWIN JORDAN, OF MURRAY, AND NATHANIEL BALDWIN, OF EAST MILL CREEK, UTAH LOUD-SPEAKER Application filed August 27, 1926. Serial No. 131,898.

This invention appertains to loud speakers of the form commonly called cone-type speakers. The principal objects are to produce a loud speaker of great simplicity of construction, to provide a simple resilient and eflicient surrounding support for the diaphragm, and to provide an instrument which can be assembled quickly or taken apart quickly for repairs.

We attain these objects by the mechanism illustrated in the accompanying drawing in which Fig. l is a section of the device showing the various parts assembled in operative relation and Fig. 2 is a front elevation of the instrument shown in Fig. 1.

In the figures of the drawing, numeral 1 designates a housing for the various parts, which housing preferably made of sheet metal, is mounted upon the base plate 2. Both ends of the housing are beaded or enlarged as shownto provide a simple means of mounting the various parts. which also may be made of sheet metal has a folded portion at one edge which fits into a beaded portion of the housing 1. A grille 4 preferably made of sheet metal has a folded edge and within this fold is clamped theedge of a circular piece of light fabric 5 serving as a screen to cover the working parts. This rille is placed against the folded edge of the and 3 and an expansible ring 6 resting against an inclined surface 7 of the housing presses against the grille 4 and holds it and the band 3 firmly in place. This expansible ring as here illustrated consists of a piece of round rod bent into a ring which is just small enough to be seated in place while its ends are in contact. 'By means of notches 8, 8 near the ends of this rod and a special tool for the v purpose the ring is then forcibly expanded separating the ends and a disc 9 of proper thickness is inserted between the ends of the rod. This holds the several parts firmly 1n lace.

5, Another grille 10 similar to the first is A band 3' edge of the diaphragm. The term width of the mounting refers to the distance between the radially inner edge and the radially outer edge of the mounting.

The operating element may be of any desired design but as here illustrated it consists of a permanent magnet 14, armature 15, polepiece 16, and spool 17 containing the actuating coil. A connecting link 18 transmits the vibration of the armature to the diaphragm.

The operating element above described is mounted upon a suitable bracket 19 which is attached to the band 3.

With this form of diaphragm support no additional weight is rigidly attached to the diaphragm and minute vibrations and particularly those of high frequency are permitted by the resiliency of the material at the place of contact while vibrations of large amplitude and particularly those of low frequency are permitted by the flexibility of the entire diaphragm support.

It is to be understood that this diaphragm and mounting may also be used in other acoustic instruments such as microphones or phonograph recorders.

We claim:

1. An acoustic device comprising a diaphragm and a flexible but substantially inelastic mounting for said diaphragm surrounding undivided portion thereof is not under lateralrestraint.

2. An acoustic device comprising a conical h diaphragm and a flexible but substantially inelastic mounting for said diaphragm surrounding said diaphragm and having its internal edge divided to form a recess to receive the edge of said diaphragm, the width of said mounting being such that a considerable area of the undivided portion thereof is not under lateral restraint.

3. A loud speaker comprising a conical diaphragm and a flexible mounting for said diaphragm surrounding said diaphragm and having its internal edge divided to form "a recess to receive the edge of said diaphragm, the width of said mounting being such that a considerable area of the undivided portion thereof is not under lateral restraint, and a band with folded edge holding said diaphragm mounting in the fold in said band.

4. A loud speaker comprising a conical dia phragm and a flexible mounting for said diaphragm surrounding said diaphragm and having its internal edge divided to form a recess to receive the edge of said diaphragm, the Width of said mounting being such that a considerable area of the undivided portion thereof is not under lateral restraint, a band with folded edge holding said diaphragm mounting in the fold in said band, a bracket attached to said band and an operating element mounted upon said bracket.

5. A loud speaker comprising a conical diaphragm and a flexible mounting for said diaphragm surrounding said diaphragm and having its internal edge divided to form a recess to receive the edge of said diaphragm, the width of said mounting being such that a considerable area of the undivided portion thereof is not under lateral restraint, a band with folded edge holding said diaphragm mounting in the fold in said band, a grille having a folded edge and fabric clamped Within the fold of said grille.

6. A loud speaker comprising a conical diaphragm and a flexible mounting for said diaphragm surrounding said diaphragm and having its internal edge divided to form a recess to receive the edge of said diaphragm, a band with folded edge holding said diaphragm mounting in the fold in said band, a housing engaging said hand, an inclined surface in said housing and an expansible ring pressing against said inclined surface and holding said band in its place.

7. A loud speaker comprising a conical diaphragm and a flexible mounting for said diaphragm surrounding said diaphragm and having its internal edge divided to form a recess to receive the edge of said diaphragm, a band with folded edge holding said diaphragm mounting in the fold in said band, a' grille having a folded edge fabric clamped within the fold of said grille, a housing engaging said band, an inclined surface in said ousing, and an expansible ring pressing against said inclined surface and holding said band and said grille in place.

8. An acoustic device comprising a diaphragm, a housing for said diaphragm, and an expansible ring engaging said housing and adapted to hold said diaphragm in place, said ring consisting of a rod bent into a circle with ends approaching each other, and a spacer inserted between said ends to tighten said ring.

ALFRED EDWIN J ORDAN NATHANIEL BALDWIN 

